Klamath River is an unincorporated community in Siskiyou County, California, United States, situated on the Klamath River. It is located on State Route 96, near the Oregon border. The name "Klamath" was derived from an Indian word Tlamatl which means "they of the river," from/-matl/ "river." in Chinook. The community of Klamath River is about 11 miles long and includes both sides of the river from Gottville to Kohl Creek. The population is 190.